function collect_same_elements(collectionA, collectionB) {
  let collectionC=[];
  for(let i=0;i<collectionA.length;i++)
    {
      for(let j=0;j<collectionB[0].length;j++)
      if (collectionA[i]==collectionB[0][j])
        {collectionC.push(collectionA[i])}
    }
  return collectionC ;
}

module.exports = collect_same_elements;
